Postal 1 dude isn't evil (and is genuinely the most morally grounded and decent person we've actually met in the Postal Universe)
From what we gather he was living a very normal life prior to going crazy, not like the other dudes who go on senseless rampages when tasked with mundane everyday things. As Promo material does state he's a well educated and mannered person so it's only realistic that this man did have a genuine job and was generating a level of income prior to his decline in mental health and moving to Paradise.
And as stated before he is well mannered in the sense of being stated a "quiet nice boy" and "voted the most likely to succeed". From what we gather this guy was the text book example of a model citizen. The only "flaw" is that he kept referring to a girl he only dated once as his girlfriend but even then that could come down his delusions along with his lack of grip on reality causing him to genuinely think she's his girlfriend or the fact he's canonically quiet (as shown from the Promo material and also the fact that he doesn't actually physically speak AT ALL during the game) and most likely doesn't understand social ques as of it.
---------------------------------------
But the most important thing is that he doesn't even have malicious intentions.
The very first thing he proposes after being "attacked" by "groups of lunatics trying to invade his home" is.....go the sherrif for help. The Dude didn't have any Intention to go on a murder spree, he'd rather of just went to the authorities like any other average Joe. The whole thing really tells us that he's not usually a violent person.
Even rewinding back to level one: the war journals (and Vince) did state that the Dude was entirely convinced that he was being attacked by group of lunatics, one of which even firing rockets at him, goes without saying that self defence is really the only option here.
Course it remains solely as self defence until the Dude reaches the train station, the significance being his war journal where he writes "if I can get out i can warn everybody...YES, I CAN WARN EVERYBODY!". The dudes goal has shifted into saving the country as a whole rather than himself which ultimately steers him into going to the air force to find out what has happened to cause the supposed hate plague. The dudes actions represent him more as selfless now with him now doing this in the bigger scheme of things rather than his own self preservation. If its not clear already: maniacs wouldn't care about warning/ saving people from a hate plague, Dude 2 most likely wouldn't give a shit and let it spread since he was totally cool with nuking the entirety of paradise and its innocent civilians.
Furthermore he openly states that he doesn't want to kill people. At the trailer park he writes that "There must be others like me, immune to this...germ warfare or whatever it is". Practically he's saying that he'd much rather run into some normal people instead of having to kill them, it's a stark contrast to the other dudes with the Postal 1 dude appearing as genuinely empathetic whereas the others will literally kill people for something as simple as waiting in line and afterwards not think anything of it.
Also very worth noting that when he enters the ghetto he mentions he's genuinely worried he'll get mugged, we're really getting the picture that he's literally just some normal ass guy with the idea of going to the rough side of town shakes him up.
(Even worth pointing out that only for the ghetto does he go back to calling it a diary like he's momentarily lost his soldier/war mentality at the thought of going into the rough side of town).
---------------------------------------
Postal 1 dudes literally just some average everyday guy (who's been through some really fucked up shit that's forever gonna remain unexplained beyond the veteran theory) who's trying to do the right thing but he's woefully misguided due to his deteriorating mental state as well as being possessed by an entity beyond his broken minds comprehension.
He's literally the complete opposite to every other postal dude (and if anything he's one of the most morally grounded people in the franchise as crazy as it is)
Oh and if this wasn't enough: rws did say on a twitter post that he's literally Just some average guy who's had some shitty days.
(I wrote this at 4am so soz if it's all over the place)
